Coincidentally, I recently installed this as well and have been happy with it the few tests I have made.

One thing though - since I already had a MagicJack account and I wasn't sure what would happen if the App was running at the same time as my MagicJack Plus was connected to wifi (if someone called the number would it ring on both? Neither? No idea.) I opted to receive the (new) free number. All well and good and allows phone calls between the two (App and Wifi phone). BUT anyone wishing to call me on my Android who is NOT calling from a MagicJack phone has to call a number in area code 305 (Miami) then punch in a ten digit code preceded and followed by * (star).

This is a major pain and is not adequately explained in the App itself.